Boat propeller



FIG. 1 is a rear elevational view of a boat propeller showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view, the bottom plan view being a mirror image thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a right side elevational view thereof. 

CLAIM The ornamental design for a boat propeller, as shown and described. 